Warp stop motion for looms



Dec. 27, 1932.

E, EGL! v 1,892,333

-WARP STOP MOTION FOR LOOMS Filed March 2l. 1930 4 Sheets-Sheet l l/NVNTUZ WARP STOP MOTION FOR LOOMS Filed March 2l. 1950 4 Sheets-Sheet 2i735 J0. FLL?. 0/

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Dec. 27, 1932e E. EGM 1,892,333

WARP STOP MOTION FOR LOOMS Filed March 21. 195o 4 sheets-sheet 3 wwwDSC. 27, 1932. E EGL] 1,892,333

WARP STOP MOTION FOR LOOMS Filed March 2l. 1930 4 Sheets-Sheet 4 i ggf lwe/v Tall 50 Figs. 16 and 17 show Patented Dec. 27, 1932 VOREJALS GASPARriGNEGGER, CF

STP MOTON AND, ASSGNR TO IASCEENENFABRIK PITI SVY'EZIERLAND FOR LQOMSApplication led March 21, 1930, Serial No. 437,813, and in SwitzerlandMarch 22, 1929.

`r stopping of the loom, which on account of t eir complicated andinaccessible construction were ot no practical use.

This invention relates to a warp stop motion of the above kind, whichhas a. very 1* simple, easily and practically manipulated device formoving the bar and initiating the stopping or" the loom. This device ischaracterized in this, that the displaceable toothed bar is .guided inthe longitudinal slot or a rail J fixed to the heddle frame and that abell crank pivoted on the heddle trame is connected at one end with themovable bar and at the other end with a pull wire which, when the loomoperating normally, allows the bar to move, but, on a warp threadbreaking and the har being locked, causes the stopping or" the loom tobe initiated.

The accompanying drawings illustrate various constructional examples otthe invent-ion.

Figs. 1, 2 and 3 are three elevations of the first ample showing theparts in different posi ions. Fig. 4 is a side elevation showing theheddle Haines and heddles in diiiierent positions. 3 is a side elevationof a modi- "i ation having equally marking heddle trames necessitatingonly a common hook and wire. liigs. 6 and 7 show portions of the toothedbars in elevation.

Fiss. S. 9 and 13 show asecond example parts in different positions.ins. 1Q and 14 show diagrannnatically ditpositions of the crank shaft.

` and 12 show a rocking push memside elevation and in plan view withshitionary bearings on the front he machine frame.

shows the push member in another positie. to that of Fig. 12.

an untoothed, ovalj heddle carrying bar and two bars having similar butoppositely directed teeth in the lowered and raised positions.

Figs. 18 and 19show a heddle resting on the untoothed, oval, bar and thesame lowered and engaged by a toothed bar.

2O shows the untoothed, oval, bar and levers for raising and loweringthe toothed bars.

21 shows an eight-end sateen weave.

Figs. 22. 28 and 24 show harness bars with two o-r three rows of heddlesand a common bell crank for actuating the bars.

1 and 11 (Figs. 1 to 3, 4 and 5) are the usual heddle trames and 2, .21and 2 the usual heddles. he warp threads in the upper shed are marked 4and those in the lower shed are marked 5 (Fig. 4). By being in tensionthey keep the heddles raised. The latter rest through the tension of thewarp threads after the commencement of the motion to form the upper shedon two horizontal bars 6 and 7 with oppositely directed teeth (Figs. Gand The bar 6 is horizontally slidable in the bar 7 of U-shapedcross-section and has a transverse pin 8 which extends through twohorizontal slots 9 in the bar 7 which is fixed immovably in the heddleframe. One arm ot a bell crank 10 which is pivoted on the heddle frame 1or 11 engages round the pin 8 with its Jforked end, while to the otherarm oi' the bell crank 10 is attached a vertical wire 12 the upper endof which is bent over to form a hook 11. Adjacent to the wire 12 issuspended a stationary wire 13. the lower end of which is bent over. Ahelical spring 14 embraces the two wires 12 and 13 having its lower endresting against the bent over portion of the wire 13 and its upper endfree. The function of the hook 11 on the wire 12 is to press on a latch15 which acts through the rod 16 so as to stop the loom when the shed isopen.

The warp stop motion described above operates as follows:

Then the heddle frame 1 (Fig. 1) is in its top position the bell crank10 will have been turned `to the lett by the helical spring 14, which isonly pressed together by the heddle frame moving out of the middleposition into the bottom position and by the Weight of the wire 12 andthe toothed bar 6 will have been displaced to the left before the heddleframe has passed into the upper shed, as the heddles 2 rest on thetoothed staves 6 and 7 through the tension in the warp threads 4 afterthe commencement of the motion for forming the upper shed. Thestationary wire 13 together with the helical spring 14 and the pull wire12 oppose the motion of the heddle frame for forming the lower shed,causing the bell crank 10 and the bar 6 to be moved to the right (seeFig. 2), the heddle frame 11 being in its lowest position. As theheddles 21 of the heddle frame 11 are raised by the Warp threads 5 ofthe lower shed the displacement of the bar 6 can take place unhindered.

Fig. 3 shows the heddle frame l1 also in its 'lowest position. On a warpthread 17 of the lower shed breaking the corresponding heddle 22 is nolonger held up and drops into the teeth of the bars 6 and 7, therebypreventing the bell crank 10 and the bar 6 moving into the extreme righthand position. Consequently the pull rod 12 will be drawn down furtherto a corresponding extent, thelatch 15 which rocks about a fixed pin 18is lowered and the stopping of the loom is initiated with the shed open.In Fig. 4 the heddle frames 1, 11 and the heddles 2, 21, 22 are shown inthe positions corresponding to Figs. 1, 2 and 3. Fig. 5 shows thesimilarly operating heddle frames l and l1 controlled by common pullWires 12 and 13.

The above described constructional form of warp stop motion in theharness is intended for fabrics in which half the heddle frames changeregularly from the top position into the bottom position. Thehorizontally displaceable toothed bar, the oppositely toothed stationaryguiding bar and the bell crank for displacing the former bar aredisposed below the warp.

The constructional form of the warp stop motion illustrated in Figs.8-15 enables it to be generally employed for fabrics in which individualgroups of heddle frames remain for an unlimited period in the lower shedand only alternately single heddle frames or several heddle framesremain in the upper shed during one or more picks, all the leavesremaining in the lower shed being controlled for broken warp threadsduring each pick.y

For effecting this according to the invention the rodwork for thehorizontal displacement of the bar is actuated independently of theheddle frame motion, the heddles rest at the moment of working in theupper shed on a smooth untoothed bar, two oppositely toothed bars guidedin an untoothed bar can be raised and lowered by a relative displacementand the toothed bars and the levers serving for their displacement arearranged above the Warp.

kbar 6 having oppositely directed teeth to the bar 3 is longitudinallydisplaceable. By means of the bell crank 10 one arm of which issubjected to the pull of a spring 101 and acted on by the pull rod 12and which is also disposed above the warp, the bar 6 can be slid in thestationary bar 3. The upper end of the pull rod 12 extends through atwo-armed lever 30 having a fixed pivot and supports a verticallyadjustable follower 31. The lever 30 is actuated by a pull rod 32, abell crank 34 to which aI tension spring 33 is attached and acontinuously rotating cam 35. Fig. 8 shows the harness at the moment inwhich it has reached its lowest position, the adjustable follower 31being exactly above the lever 30. This position corresponds to theangular position Fig. 10) of the crank shaft. Fig. 9 shows the parts inthe angular posit-ion 101 of the crank shaft (Fig. 10). The horizontalarm of the bell crank 34 is lowered and the toothed bar 6 has beenpushed to the right by the parts 32, 30, 31, L2 and 10.

A. second bell crank 36 has one arm acted on by a tension spring 37 andactuated by the cam 38. To the horizontal arm of the bell crank 36 avertical rod 39 is pivotal-ly attached (Figs. 3, 9, 11, 12, 13 and 15),Vwhich operates a carrier 40 and in the latter a rocking two-armed pushmember or repeller 41. The rod 39 extends through a lever 42 which actson the stop mechanism. VWhen the rod 39 is in its lowered position thepush member or repeller 41 occupies a position (Fig. 13) in which duringthe forward motion of the slay 43 13) it is struck by a striking member44 fixed to the slay and can thereby rock the lever 42 for stopping theloom. u

A; stationary roller 46 supported on the front portion of the machineframe 45 is intended to rock the push member or repeller 41 out of thepath of the thrust piece 44-after the repeller has initiated thestoppage of the loom and before the end of the oscillation of the slaytowards the breast beam to make provision for the necessary but shortmovement of the slay that takes place during the actual stopping of theloom and to enable the slay to complete its forward movement when theloom is restarted. The length of the roller 46 is equal to the amplitudeof movement of the rod 39 so that the front arm of the repeller 41 inboth its upper and lower positions bears against the roller.

On the s lli) rocking arm 40 is rotatably supported a twoarmed pawl 47,one arm of which is subject to the pressure of a spring 48, whilst theother arm is intended to hold the head 50 of the rod 39. which isadapted to be depressed by hand, for any desired period in order todisconnect. the stopping device, the repeller 41 occupying the positionshown in dot-anddash lines in Figure 11. fr rod 51 (Figures 8 and 13)resiliently connects `the lever 30 with a bell-crank lever 52 having astepped vertical arm, by means of which the bellcrank lever 36 can belocked in its lower position.

Normally, however, the rod 39 is caused to perform upward and downwardmovements through the agency of the cam 33. rIhis movement can beinterrupted so that the rofl 39 remains at a half-way or middle positionwhereby the thrust piece 44 is directed on to the repeller 41, thisbeing effected when the lever 36 is locked by the bell-crank lever 52.The lever 36 is again influenced by the rod 32 and the lever -when aheddle 21 is gripped in the serrations of the rods 3 and 61, so that thebell-crank lever 10 and the tension wire 12 remain in a half-wayposition.

In Figure 13 it is assumed that the heddle 21 is lowered in consequenceof breakage of the warp thread 41, and the displaceable stop motion bar61 therefore looked by the dropped heddle 21. The lever 34 is lowered bythe cani 35 but the rod 32 operated through a spring Si is hindered inits movement, since the positioning follower 31 is held down by the wire12 and the bell-crank lever 10 by the engagement of the lowered heddlein hars 3 and 61 and by the interruption of the displacement thereof.The lever 30 and rod 51 are thereby retained in the middle positionshown in Figure 13 and the bell-crank lever 52 remains in a position inwhich it locks the bell-crank lever 36 so that it cannot be raised bythe pull of the spring 37. Consequently the rod 39 remains in the middleposition in which the rotatable repeller 41 is engaged and pushed baclby the thrust piece 44, whereby the loom is stopped. Normally when theheddle 21 1s not lowered, the rod 32, the lever 30 and the rod 51 arelowered, the lever 52 is operated b v the rod 51 and is moved out of itslocking position, thus causing the lever 36 to be raised by its spring37 and to raise the rod 39 to a position where the repeller 41 is abovethe level of the part 44.

in Figure 14, 101 again denotes the angular position with the maximumdisplacement of the toothed bar G1 the angular position 102,

` the moment of commencement of the stoppage of the loom by the thrustpiece 44 and the repeller 41, and 103 the angular position at which theloom has already come to a standstill. This occurs 15 millimeters beforethe throw of the reed on the material.

The stopping of the slay about 15 m/ms. be-

fore the throw of the reed on the material is edected by a brake,preferably a band brake,v

which is brought into action to stop the loom earlier than is usuallythe case through the action of the thrust piece 44 on the repeller 41.The actuating Contact between the repeller and the thrust piece forinitiating the stoppage of the loom takes place about 5 cms. before theforemost position of the slay, as a result of which it is necessary forthe repeller 41 to be subsequently deiiected by the roller 46 from thepath of the thrust piece 44 in order to enable the slay to continue itsforward movement unhindercd 15) whilst the loom is stopping, the actualstoppage occurring at a predetermined distance from the forwardmostposition of the slay and previous to the beat up, this predetermineddistance varying with the point at which the thrust piece is arranged tofirst contact with the repeller 41.

As a result it is possible to stop the loom about 15 m/ms. before theforemost position of the slay.

Accordingly the loom does not have to be rotated back for the purpose ofdrawing in broken warp threads.

The disconnection of the automatic stop motion by means of pressure onthe knob 50 of the rod 39 and the consequent lowering of the repeller 41under the thrust piece 44 is to enable it to be interrupted at will, inthe event of irregularities in the warp tension, warp threads ruimingout, and so forth, until the disturbing warp threads are found. By themethod hereinbefore described of actuating the redding for thehorizontal displacement of the stop motion bar 61 independently of themotion of the leaf of heddles a general application of the warp stopmotion harness is rendered possible, that is to say, for two-shaft andmulti-shaft fabrics in which individual groups of leaves of heddlesremain in the lower shed for any desired time, all the leaves thatremain in the lower position being controlled as regards warp-threadbreakage during every pick.

TWhen a heddle frame is raised the corresponding follower 31 is raisedaway from the lever 30 so that it cannot interfere with or be affectedby the movements thereof. Consequently the corresponding bar 51 remainsstationary whilst the heddle frame is in its raised position.

in the example shown in Figs. 10-20 the stationary toothed bar 3 (Fig.8) replaced b v an untoothed guiding bar 31 which is fixed to theharness, two ha rs 62 and T1 raving s'. but oppositelv directed teethbeing capable of sliding with respect to one aneth er in a longitut inalgroove in the bar 31. The bars 61 and @"2 are lowered at the moment whenthe heddle frames are worl'ing in the upper. shed into the untoothed giVding stave o1 so that the heddles 2 rest on the smooth bar 31 andconversely are raised out of the bar 31 at the moment in which theheddle frames are in their bottom position, for engaging with anyheddles that may have dropped through the breakage of warp threads.

The following arrangement is provided for operating the stop motion bars61 and 72: The pull rod 12 (Fig. 20) is connected to two bell cranks 102and 103 which are pivoted to the stop motion harness and each of whichis provided with a forked arm. On the leal' L rs G1 is lined a pin 54which eX- tends through an inclined slot 53 in the bar 31 of ovalcross-section, and on the bar 7 2 a pin 5G which extends through anoppositely inclined slot 55 in the bar 31. The pin 51 is engaged by theforked arm of the bell crank 102 and the pin 56 by that of the bellcrank 103. Figs. 16 and 18 show the two tooth-ed bars 62 and 72 in theposition in which they have been lowered into the bar 31 by the members51, 102, 103, i3-56 so that the heddles 2 rest on the bar 31. Fig. 20shows the bars 62 and 7 2 raised out of the bar 81 by the inclined slots53 and 55 and the pins 54 and 56 and ready for feeling for any heddlesdropped by the breaking of a thread. VF ig. 19 shows a dropped heddle 2which has been engaged by the toothed bars 62, 7 2 and thereforeprevents their further displacement and stops the loom. In the 8-endSateen weave shown in Fig. 21 the heddle frame l remains in the lowershed for 7 picks, during which period the bars check seven times Whetherany warp threads are broken.

Figs. 22, 23 and 2-1 show heddle frames 11 with two and three I'iXedtoothed bars 73 lying one behind the other, bars 63 which are slidablein the same and two or three rows of heddles 2. A common bell crank 104actuates the two or three bars 6 lying one behind the other by engagingwith `the transverse pin 8 common to them all.

lha-t I claim is:

1. In a warp stop motion for looms, the combination with a heddle frameprovided with a series of heddles, a stationary toothed bar supported bythe heddle Jframe, a countertoothed bar longitudinally movable in thesaid frame, both toothed bars being movable together with the heddleframe, means for longitudinally moving the second toothed barmdependently of the motion of the heddle frame, a push member pivotallymounted on a vertically movable rod controlled by the movable toothedbar and capable of operating the stopping device, a striking memberfixed to the slay and capable of acting upon the lower push member and aroller mounted in the front part of the machine and capable of rockingthe said push member out o the path of the striking member before theslay has completed its forward swinging movement.

lower the said rod to bring the said push member out of the path of thestriking member of the slay and means to lock the said rod in thelowered position to render the stop motion inoperative or to beYinterrupted at will.

f In testimony whereof I have affixed my si gnature.

ERNST EGLI.

